Bryant r



(No Model.)

B. R. SOCKMAN.

SELF LOCKING PULLBY.

No. 473,093. Patented Apr. 19, 1892.

UNIT-ED STATES f v PATENT OFFICE.

BRYANT R. SOOKMAN, OF MOUNT VERNON, OHIO, ASSIGNOR OF ONE-HALF TO VILLIAM L. MCINTIRE, OF SAME PLACE.

SELF-LOCKING PU LLEY.

SPECIFICATION forming part of Letters Patent No. 473,093, dated April 19, 1892.

Application tiled December 26, 1891. Serial No. 4116 ,196. (No model.)

To all whom t may concern:

Be it known that I, BRYANT R. SooKMAN, a citizen of the United States of America, residing at Mount Vernon, in the county of Knox and State of Ohio, have invented certain new'and useful Improvements in Self- Locking Pulleys, of which the following is a specification, reference being had therein to the accompanying dra-wings.

This invention relates to an improvement in self-locking pulleys; and it has for its 0bjects, first, to provide a pulley having locking mechanism adapted to be actuated by the weight of the load being lifted to lock the pulley or pulleys against rotation, whereby should the hoisting-rope break at a point removed from the pulley or should it be released bythe operator the lockingmechanism will be automatically actuated to lock the pulley, and thus prevent the load from descending, and, secondly, to provide a self-locking pulley having a stationary yoke carrying the pulleys and a stop-block, and a swinging head carrying a locking-block and mechanism for swinging the head, whereby the locking-block may be readily released from contact with the stop-block by the swinging of the said head.

The invention will iirst be described in connection with the accompanying drawings and then pointed out in the claims.

Figure 1 is a side elevation of the pulley as it appears when ready for use. Fig. 2 is a vertical longitudinal sectional view showing the positions occupied by the locking-block with relation to the stop-block when in locked and unlocked positions, thelatter position being shown in dotted lines. Fig. 3 is an end elevation looking in the direction of the arrow in Fig. l, showing more particularly the construction of the releasing mechanism.

Referring to the drawings, A designates the yoke; B, the swinging head; C, the lockingblock; D, the stop-block; E and F, the pulleys, and G the releasing mechanism.

The yoke A is constructed, preferably, of two pieces of metal clamped together by bolts 1 and held at a suitable distance apart by the stop-block D, which latteris also held in place by the bolts l, a double hook 2, engaging with openings near the top of the respective sides of the yoke, serving as a means to suspend the latter from any desired fixture. The swinging head B is'also preferably constructed of two sections, each of which is formed with a straight or base portion 3 and an arch 4. Near the top of each arch is a slot 5, the two slots being arranged in horizontal register with each other and serving as bearings for a rod 6, which passes through and supports the locking-block in a position to be normally out of engagement both with the stop-block D and the pulley E, as clearly shown in'Fig. 2, and also serves the purpose of limiting the downward movement of the head when the locking-block is out of engagement with the stop-block, as clearly shown in Fig. 1. The base portions 3 project some distance beyond the arches at both ends of the head, the projecting portions at one end forming a support for the head-releasing mechanism, which comprises a rod 7, on which is journaled a grooved guide-roller S, a link 9,

and a cord 10, and the opposite end as a means of attachment for a link 1l, to which is secured one end of the hoisting-rope H. The head is pivoted intermediate its length on a rod 12, which latter also forms a journal for the pulley E, to which reference has been made, the pulley F being journaled on a rod 13, passing through the lower portion vof the yoke. The two sections of the head are held at a suitable distance apart by means of a spacing-block 14, Fig. 2.

Having thus fully described the different parts of my invention, I will explain the manner of its operation: One end of the hoistingrope is passed over the guide-roller 8, then around pulley E, then through a block I, then over pulley F, then back again through blockI, and is secured to the link 10. The block I carries ahook or other device (not shown) for supporting the load to be lifted. As soon as strain is applied to the hoisting-rope the head B is swung to the position shown in Fig. 1, thus moving the locking-block C outV of contact with the block D. I/Vhen it is desired to poise the loadl being lifted, the rope I-I is released and the load will immediately swing the head to the position shown in dotted lines in Fig. 2, thereby bringing the locking block into Contact with the inclined under face of the stop-block, which formerbears upon the hoisting-rope and locks the pulley E in an obvious manner. To release the rope the eord 10 is pulled down, thereby swinging the head back to the position shown in Fig. l.

I-Iaving thus fully described my invention,

what I claim as new, and desire to secure by l Letters Patent, is

l. In a self-locking pulley, a stationary yoke carrying a stop-block and a pulley, in combination with a swinging head journaled Within the yoke and carrying a guide-roller at one end, a locking-block, and a hoisting-rope secured to the free end of the said head and passing around the said pulley and over the guide-roller.

2. In a self-locking pulley, astationary yoke carrying a rigid stop-bleek and a. pulley, in combination with a swinging head journaled Within the yoke and having two slots arranged in horizontal register, aloeking-bloek located below the stop-block, a rod Working in 'said slots to support theloeking-bloek and to limit the movement of the head, a guide-roller carried by one end of the head, and a hoistingrope secured to the other end and passing around the said pulleys and ovex1 the guideroller.

3. In a self-looking pulley, a stationary yoke carrying a stop-block and a series of pulleys arranged one above the other, in combination with a swinging head pivoted on the axle of one of the pulleys and carrying a lockingbloek adapted to be moved into and out of engagement with the stop-block by the swinging of the head, and a hoisting-rope passing around the said pulleys.

In testimony whereof I allix mysignature in presence of two witnesses.

BRYANT R. SOCKMAN. Witnesses:

WILL E. GRANT, F. O. LEVERING. 

